Which statement is true about gene expression? Cells become specialized because different cells contain different sets of genes
Gene expression occurs primarily when DNA is replicated before the process of
mitosis
The DNA of repressed genes gets destroyed because it is not being used
A cell becomes specialized by controlling the which proteins are produced from
the cell's DNA

1. environmental factors, such as ph and temperature, can affect the function of an enzyme. a. true b. false 2. which of the following is an organic molecules (ex. vitamins) that an enzyme? a. coenzyme b. product c. active site d. substrate 3. how do enzymes effect the speed of a chemical reaction? a. they speed it up b. they slow it down c. they have no effect on the speed of a reaction 4. during a chemical reaction, an enzyme is used up so that it can only be used one time. a. true b. false 5. which of the following results from a chemical reaction that is catalyzed by an enzymes? a. active site b. product c. substrate d. coenzyme

How do you date a sample of rock that you suspect as being one of the earliest on earth

Someone me with this: a mineral' is determined by its actomic structure.